Golf head and manufacturing method thereof

ABSTRACT

Disclosed is a golf head, comprising a head body and a weight balancing block welded onto the head body which is made of tungsten, nickel and copper and welded onto the titanium alloy head body which can prevent a brittle phase and increase the service life of the golf head; further, the head body is provided with a chamber in which the weight balancing block is placed, the weight balancing block has a surface provided with a welding bead groove towards an inner surface of the chamber which can prevent welding flux from falling off and thus increase welding stability of the weight balancing block. Further disclosed is a method of manufacturing the golf head, by metal injection moulding, the weight balancing block can be made into various complicated shapes matched with the shape of head body, with less moulding process, smooth moulding surface, high flatness and high production efficiency.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national stage application under 35 U.S.C. 371 of PCT Application No. PCT/CN2017/106780 having an international filing date 19 Oct. 2017, which PCT application claimed the benefit of CN Application No. 201710567075.1 filed 12 Jul. 2017, the entire disclosure of each of which are hereby incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to the field of golf tools, and more particularly, to a golf head and a manufacturing method thereof.

BACKGROUND OF THE INVENTION

Golf is a popular leisure sport. Since the golf sport is popular, great attention is increasingly paid to golf tools. The golf head on the current market comprises a titanium alloy body and a weight balancing block welded onto the titanium alloy body. However, when the current weight balancing block is welded with the titanium alloy, a brittle phase will be generated, which is difficult to weld and a welded position is easy to crack.

BRIEF SUMMARY OF THE INVENTION

In order to solve the problems above, the present invention provides a golf head with a steadily welded weight balancing block and a manufacturing method thereof.

A technical solution used to solve the technical problem according to the present invention is as follows:

A golf head, comprising: a head body, and a weight balancing block welded onto the head body, wherein the weight balancing block is made of tungsten, nickel and copper.

The proportion of the tungsten to nickel to copper is 70-90 to 7-24 to 3-6.

The head body is provided with a chamber in which the weight balancing block is placed, and the weight balancing block has a surface provided with a welding bead groove towards an inner surface of the chamber.

A method of manufacturing the golf head above, comprising: a weight balancing block manufacturing process, comprising: step A of preparing materials: preparing tungsten, nickel and copper, adding a binder into the tungsten, nickel and copper, and manufacturing a mould matched with the shape of the weight balancing block; step B of conducting injection moulding: injecting the tungsten, nickel and copper, and the binder in step A into the mould by metal injection moulding, so as to obtain a workblank of the weight balancing block; step C of demoulding: demoulding the workblank of the weight balancing block in step C from the mould; step D of catalyzing and degreasing: placing the workblank of the weight balancing block in step D into a catalytic degreasing furnace for catalyzing and degreasing; and step E of sintering: placing the workblank of the weight balancing block after catalyzing and degreasing into a heating furnace for sintering; a head body manufacturing process, by which the head body can be obtained through processing; and an assembly process, comprising: welding the weight balancing block after sintering in step E onto the head body to obtain the golf head.

The binder in step A comprises polyformaldehyde, high density polyethylene, ethylene-vinyl acetate, wax and stearic acid.

The step D comprises: step D1: discharging air in the catalytic degreasing furnace and filling nitrogen into the catalytic degreasing furnace; and step D2: filling concentrated nitric acid after gas atomization into the furnace to decompose and discharge partial polyformaldehyde in the workblank of the weight balancing block in step C.

The catalyzing and degreasing is conducted at a temperature of 100 to 130° C. for 15 to 24 h.

The step E comprises: step E1, gasifying and discharging residual polyformaldehyde in the workblank after degreasing and other materials in the binder under a sintering temperature below 800° C.; step E2, forming a liquid phase for the nickel metal and copper metal in the workblank of the weight balancing block under a sintering temperature of 800 to 1380° C., adding tungsten metal into the liquid phase, and sintering for moulding; and step E3, cooling the heating furnace to a temperature below 70° C. and then taking out the product.

The present invention has the beneficial effect that: disclosed is a golf head, comprising a head body and a weight balancing block welded onto the head body which is made of tungsten, nickel and copper and welded onto the titanium alloy head body which can prevent a brittle phase and increase the service life of the golf head; further, the head body is provided with a chamber in which the weight balancing block is placed, the weight balancing block has a surface provided with a welding bead groove towards an inner surface of the chamber which can prevent welding flux from falling off and thus increase welding stability of the weight balancing block. Further disclosed is a method of manufacturing the golf head, by metal injection moulding, the weight balancing block can be made into various complicated shapes matched with the shape of head body, with less moulding process, smooth moulding surface, high flatness and high production efficiency.

DETAILED DESCRIPTION OF THE INVENTION

A golf head according to the present invention comprises a head body and a weight balancing block welded onto the head body, wherein the weight balancing block is made of tungsten, nickel and copper. The proportion of the tungsten to nickel to copper is 70-90 to 7-24 to 3-6. The weight balancing block is made of tungsten, nickel and copper. The weight balancing block welded on the titanium alloy head body can prevent a brittle phase, so as to increase the service life of the golf head.

Preferably, the head body is provided with a chamber in which the weight balancing block is placed, and the weight balancing block has a surface provided with a welding bead groove towards an inner surface of the chamber. The welding bead groove can prevent the welding flux from falling off, so as to increase the stability of weight balancing block welded onto the head body.

A method of manufacturing the golf head according to the present invention, comprising:

a weight balancing block manufacturing process, comprising:

step A of preparing materials: preparing tungsten, nickel and copper, adding a binder into the tungsten, nickel and copper, and manufacturing a mould matched with the shape of the weight balancing block;

step B of conducting injection moulding: injecting the tungsten, nickel and copper, and the binder in step A into the mould by metal injection moulding, so as to obtain a workblank of the weight balancing block;

step C of demoulding: demoulding the workblank of the weight balancing block in step C from the mould;

step D of catalyzing and degreasing: placing the workblank of the weight balancing block in step D into a catalytic degreasing furnace for catalyzing and degreasing; and

step E of sintering: placing the workblank of the weight balancing block after catalyzing and degreasing into a heating furnace for sintering;

a head body manufacturing process, by which the head body can be obtained through processing; and

an assembly process, comprising:

welding the weight balancing block after sintering in step E onto the head body to obtain the golf head.

In the embodiment, the head body manufacturing process is a manner of casting, and the titanium alloy head body is made by casting; in other embodiment, the head body manufacturing process may also be CNC cutting process and other machine processing manners.

Wherein, the binder in step A comprises POM (polyformaldehyde), HDPE (high density polyethylene), EVA (ethylene-vinyl acetate), wax and SA (stearic acid). In step A, the amount of each metal may be selected according to proportion of the tungsten to nickel to copper of 70-90 to 7-24 to 3-6 according to the density of the weight balancing block.

The step D comprises: step D1, discharging air in the catalytic degreasing furnace and filling nitrogen into the catalytic degreasing furnace; and step D2, filling concentrated nitric acid after gas atomization into a furnace chamber to decompose and discharge partial polyformaldehyde in the workblank of the weight balancing block in step C.

The catalyzing and degreasing is conducted at a temperature of 100 to 130° C. for 15 to 24 h.

The step E comprises:

step E1, gasifying and discharging residual polyformaldehyde in the workblank after degreasing and other materials in the binder under a sintering temperature below 800° C.;

step E2, forming a liquid phase for the nickel metal and copper metal in the workblank of the weight balancing block under a sintering temperature of 800 to 1380° C., adding tungsten metal into the liquid phase, and sintering for moulding; and

step E3, cooling the heating furnace to a temperature below 70° C. and then taking out the product.

In the assembly process, the weight balancing block taken out in step E is welded onto the head body to obtain the golf head. In this embodiment, the golf head is made of titanium alloy, the weight balancing block above is welded onto the head body through a titanium welding wire under vacuum, and the welding conducted under vacuum avoids the copper from being oxidized during welding to cause a welding crack; and the welding conducted under vacuum also avoids the entrance of hydrogen and vapour, and prevents air holes in a welding joint caused by hydrogen and vapour.

The method of manufacturing the golf head according to the present invention manufactures the weight balancing block by metal injection moulding, the weight balancing block may be made into various complicated shapes to match with the shape of the head body, and the method has the advantages of less moulding process, smooth moulding surface, high flatness and high production efficiency.

The embodiments above are only preferred solutions of the invention, and the invention may also have other solutions. Those skilled in the art may also make equal deformations or replacements without departing the spirit of the invention, and all these equal deformations and replacements shall all fall within the scope set by the claims of the application. 

1.-3. (canceled)
 4. A method of manufacturing a golf head comprising: a weight balancing block manufacturing process, comprising: step A of preparing materials: preparing tungsten, nickel and copper, adding a binder into the tungsten, nickel and copper, and manufacturing a mould matched with the shape of the weight balancing block; step B of conducting injection moulding: injecting the tungsten, nickel and copper, and the binder in step A into the mould by metal injection moulding, so as to obtain a workblank of the weight balancing block; step C of demoulding: demoulding the workblank of the weight balancing block in step C from the mould; step D of catalyzing and degreasing: placing the workblank of the weight balancing block in step D into a catalytic degreasing furnace for catalyzing and degreasing; and step E of sintering: placing the workblank of the weight balancing block after catalyzing and degreasing into a heating furnace for sintering; a head body manufacturing process, by which the head body can be obtained through processing; and an assembly process, comprising: welding the weight balancing block after sintering in step E onto the head body to obtain the golf head.
 5. The method of manufacturing the golf head according to claim 4, wherein the binder in step A comprises polyformaldehyde, high density polyethylene, ethylene-vinyl acetate, wax and stearic acid.
 6. The method of manufacturing the golf head according to claim 5, wherein the step D comprises: step D1: discharging air in the catalytic degreasing furnace and filling nitrogen into the catalytic degreasing furnace; and step D2: filling concentrated nitric acid after gas atomization into the furnace to decompose and discharge partial polyformaldehyde in the workblank of the weight balancing block in step C.
 7. The method of manufacturing the golf head according to claim 6, wherein the catalyzing and degreasing is conducted at a temperature of 100 to 130° C. for 15 to 24 h.
 8. The method of manufacturing the golf head according to claim 5, wherein the step E comprises: step E1, gasifying and discharging residual polyformaldehyde in the workblank after degreasing and other materials in the binder under a sintering temperature below 800° C.; step E2, forming a liquid phase for the nickel metal and copper metal in the workblank of the weight balancing block under a sintering temperature of 800 to 1380° C., adding tungsten metal into the liquid phase, and sintering for moulding; and step E3, cooling the heating furnace to a temperature below 70° C. and then taking out the product.
 9. The method of manufacturing the golf head according to claim 4, wherein the proportion of the tungsten to nickel to copper is 70-90 to 7-24 to 3-6.
 10. The method of manufacturing the golf head according to claim 4, wherein the head body is provided with a chamber in which the weight balancing block is placed, and the weight balancing block has a surface provided with a welding bead groove towards an inner surface of the chamber. 